I can confirm this bug still exists on Ubuntu Jaunty, 9.04.  Here are
some filtered results from "mount":

~$: mount
/dev/sdc6 on /home type ext3 (rw,relatime,errors=remount-ro,acl)
/dev/mapper/isw_dihagdeiig_RAID03 on / type ext3 (rw,relatime,errors=remount-ro)
/dev/mapper/isw_dihagdeiig_RAID07 on /mnt/storage type ext3 
(rw,relatime,errors=remount-ro,acl)
/dev/mapper/isw_dihagdeiig_RAID01 on /mnt/windows_vista type fuseblk 
(rw,nosuid,nodev,allow_other,default_permission,blksize=4096)

----

Basically the gnome-system-monitor applet can monitor hard disk
activity.  It monitors /dev/hd#, /dev/sd# (IDE & SATA drives, USB
Sticks, etc.) just fine.  However, devices which exist in /dev/mapper
(from the dmraid configuration) are not monitored for disk I/O activity,
and they should be.

In my particular example, the only disk which shows disk I/O in the
applet is activity against my /home drive.  The root filesystem resides
on /dev/mapper/isw_dihagdeiig_RAID03, and it never shows I/O.

If you require any additional information, I'd be more than pleased to
provide.

** Changed in: gnome-system-monitor (Ubuntu)
       Status: Invalid => Confirmed

-- 
gnome-system-monitor does not display hd reads to fake-raid
https://bugs.launchpad.net/bugs/126618
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